Cutting R2558

dovesgate
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Cutting R2558

« on: September 17, 2011, 11:07:46 PM »

I saw this diamond and the video and I think the idea of buying a rough diamond and having it cut is really kinda cool.

The description says it could end up as a roughly .80 Radiant. Is there any idea what the final clarity of it could end up being?

Can anything be done with the rest of the diamond that gets cut off? Little studs or something?


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oldmancoyote
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Re: Cutting R2558

« Reply #1 on: September 18, 2011, 04:30:35 AM »

Clarity: no-one is going to know until a window is polished, and even then it will be an approximate answer (within 1 or 2 grades)

Using the rest: the vast majority of the rest will end up as microscopic particles. Smaller gemstone rough pieces aren't "cut" like wood is. They are "filed" into shape using abrasives - mostly made out of diamond grit.

Large pieces of rough are also truly cut using lasers or diamond edge saws (and in the olden times they were cleaved using steel wedges - the Cullinan was cleaved in nine pieces this way), but I don't think there is enough material to saw R2558 in more than two pieces, and it may well be that if you did that you would not be able to cut a well-shaped 0.80 radiant out of the largest piece.

Said all this, I'm not a cutter; if you are interested, I'm sure David can take it to one and get a definite answer.


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dovesgate
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Re: Cutting R2558

« Reply #2 on: September 18, 2011, 06:05:15 PM »

Oh I see. I thought where the diagram showed a chunk to come off meant that piece would just be cut off not that it would be filed down to that point.

This makes me wonder what size rock generates little stones like .10-20 or melee. I always assumed those were the leftovers from bigger stones being cut. Once again, thank you for sharing your knowledge with me Omc.


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oldmancoyote
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Re: Cutting R2558

« Reply #3 on: September 19, 2011, 01:47:54 AM »

They could well be cut out of larger stones. But it depends on the colour, size, shape and clarity of the rough, and on who owns it and the demand they are facing.

As a consumer that owns a piece of rough, getting (say) a 0.70 and two 0.10 out of a piece of rough is less interesting than getting a 0.80 alone, considering you normally have no easy way of selling or using the 0.10. As a cutter or wholesaler it may well be different.

BTW - sawable rough (i.e. rough that can be cut in more than one piece and thus from which more than one stone can be faceted) costs 2-3 times more than a flat crystal that can only be used to get one stone in specific shapes (trilliant or heart, mostly).


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